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ASE Automobile & Light Truck (A1–A8) — Practice Exam

A5 Hydraulic and power brakes: practice questions

Our ASE A1–A8 bank has 22 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1 · A5 Brakes

Under FMVSS 116, what is the minimum dry boiling point (ERBP) for DOT 4 brake fluid?

  1. 205 °C (401 °F)
  2. 230 °C (446 °F)
  3. 260 °C (500 °F)
  4. 180 °C (356 °F)
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B. 230 °C (446 °F) — DOT 3 is 205 °C and DOT 5 is 260 °C; the wet minimum for DOT 4 is 155 °C.

Question 2 · A5 Brakes

A parking brake doesn't hold on a hill. What should be checked?

  1. The ABS pump
  2. Cable adjustment and freedom, and shoe or pad condition
  3. The master cylinder bore and the rear wheel cylinders
  4. The brake fluid boiling point
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B. Cable adjustment and freedom, and shoe or pad condition — Seized cables are common in salty regions.

Question 3 · A5 Brakes

What does a metering valve do on some disc/drum systems?

  1. Adjusts the drum brakes
  2. Warns of a pressure loss in either circuit by switching on the red brake warning lamp
  3. Delays front disc application until rear drum shoes contact the drums
  4. Limits rear pressure
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C. Delays front disc application until rear drum shoes contact the drums — It gives more even braking at light pedal pressure.

Question 4 · A5 Brakes

What material must be used to replace a steel brake line?

  1. Copper tubing with single flares, which is easier to bend and flare in the shop
  2. Plastic tubing
  3. Approved steel (or specified alloy) tubing with double or ISO flares
  4. Rubber fuel hose
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C. Approved steel (or specified alloy) tubing with double or ISO flares — Copper can fatigue and crack under vibration.

Question 5 · A5 Brakes

Why is a dual (split) hydraulic system used?

  1. To power the booster
  2. To double brake force at each wheel during a panic stop
  3. If one circuit fails, the other can still stop the vehicle
  4. To cool the fluid
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C. If one circuit fails, the other can still stop the vehicle — Systems are split front/rear or diagonally.

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